This lecture discusses the ancient Greek philosopher Aristotle' work, On Interpretation, focusing on his discussion of modal terms such as possible (dunaton), contingent (endekhomenon), impossible (adunaton), and necessary (anankhaion) as they are used in propositions, where affirmations or negations possess truth or falsity. He also discusses what real and mistaken contradictions of these types of propositions are.To support my ongoing work, go to my Patreon site - www.patreon.com/sadlerIf you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIOYou can find over 4,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadlerPurchase Aristotle's On Interpretation - amzn.to/3nS55ud